Smoking and chewing habits of people of Karachi--1981.
D000328:Adult; D000367:Age Factors; D000368:Aged; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010154:Pakistan; D010944:Plants; D010947:Plants, Toxic; D011897:Random Allocation; D012737:Sex Factors; D012907:Smoking; D013223:Statistics as Topic; D011795:Surveys and Questionnaires; D014026:Nicotiana